we compare tax rates then and now. and social security expert larry kotlikoff examines the way your benefits are taxed. all that and more is on our web site, newshour.pbs.org. gwen? >> ifill: and that's the newshour for tonight. on tuesday, we'll look at the bombings that rocked boston. >> brown: and i'm jeffrey brown. we'll see you online, and again here tomorrow evening. thank you for joining us. good night. >> major funding for the pbs newshour has been provided by: >> bnsf railway. >> macarthur foundation. >> and with the ongoing support of these institutions and foundations. and... >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. captioning sponsored by macneil/lehrer productions captioned by media access group at wgbh access.wgbh.org >>> market sell off, the three major indexes have the worst day since november 7th. >> losing luster l gold prices see their buggest one-day drop since 1980. >> and adding to the c